save info to data file

src/main/java/xyz/hynse/foliaflow/FoliaFlow.java

@@ -5,6 +5,7 @@ import io.papermc.paper.threadedregions.scheduler.RegionScheduler;
 import org.bukkit.*;
 import org.bukkit.block.Block;
 import org.bukkit.block.data.type.Slab;
+import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.entity.BlockDisplay;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.EntityType;
@@ -15,6 +16,8 @@ import org.bukkit.event.entity.EntityChangeBlockEvent;
 import org.bukkit.plugin.java.JavaPlugin;
 import org.bukkit.util.Vector;
 
+import java.io.File;
+import java.io.IOException;
 import java.util.*;
 public class FoliaFlow extends JavaPlugin implements Listener {
     private final double vh = 0.2;
@@ -69,6 +72,14 @@ public class FoliaFlow extends JavaPlugin implements Listener {
         }, 20L, 1L);
 
 
+        File dataFile = new File(getDataFolder(), "data.yml");
+        YamlConfiguration config = YamlConfiguration.loadConfiguration(dataFile);
+
+        // Get the existing flag value, or default to false if it doesn't exist
+        boolean entitySpawned = config.getBoolean("entity_spawned", false);
+
+        // If the entity has not already been spawned, spawn it and set the flag to true
+        if (!entitySpawned) {
             RegionScheduler schedulerdisplay = getServer().getRegionScheduler();
             String tag = "FoliaFlow_Display";
 
@@ -81,18 +92,26 @@ public class FoliaFlow extends JavaPlugin implements Listener {
                     getLogger().info("Loaded Chunk");
                 }
 
-            // Check if a block display entity with the specified tag already exists
                 boolean displayExists = endWorld.getEntitiesByClass(BlockDisplay.class).stream()
                         .anyMatch(entity -> entity.getScoreboardTags().contains(tag));
+                getLogger().info("Exist BlockDisplay" + "(" + tag + ")");
 
-            // Spawn a new block display entity only if it doesn't already exist
                 if (!displayExists) {
                     BlockDisplay display = (BlockDisplay) endWorld.spawnEntity(new Location(endWorld, 100.0005, 48, -0.0005), EntityType.BLOCK_DISPLAY);
                     display.setBlock(Bukkit.createBlockData(Material.OBSIDIAN));
                     display.addScoreboardTag(tag);
                     getLogger().info("Setup BlockDisplay" + "(" + tag + ")  " + display);
+
+                    // Set the flag to indicate that the entity has been spawned
+                    config.set("entity_spawned", true);
+                    try {
+                        config.save(dataFile);
+                    } catch (IOException e) {
+                        getLogger().warning("Failed to save plugin data file");
+                    }
                 }
             });
+        }
 
 
         getServer().getPluginManager().registerEvents(this, this);
@@ -133,7 +152,7 @@ public class FoliaFlow extends JavaPlugin implements Listener {
                     dummy.setVelocity(dummyVel);
                 }
             } catch (NullPointerException dummy) {
-                getServer().getLogger().info("onFallingBlockToBlock error (likly chunky it not load)");
+                getServer().getLogger().info("onFallingBlockToBlock error (likely chunky it not load)");
             }
         }
     }